Mold for making chilled rolls.



No. 65s,o|s.- f Patented Aug. l4, I900. F. GORMAN.

MOLD FOR MAKING CHILLED ROLLS.

(Application filed June 16, 1900.) (No Model.)

UNITED STATES PATENT OFFICE.

FRANK GORMAN, OF MOUNT OLIVER, PENNSYLVANIA.

MOL'DFOR MAKING CHILLED ROLLS.

SPECIFICATION forming part of Letters Patent No. 656,018, dated August 14, 1900.

Application filed June 16 1900.

To all whom it may concern:

Be it known that I, FRANK GORMAN, a citizen of the United States, residing at Mount Oliver, in the county of Allegheny and State of Pennsylvania, have invented certainne'w and useful Improvements'in Molds for Mak= ing Chilled Rolls; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to. improvements in molds for making chilled rolls.

The object of the invention is to provide a mold of this character which is simple of construction, durable, and efficient in operation and in which the parts most subject to wear and injury may be readily replaced at reasonable cost.

WVith this and other minor objects in View the invention consists in certain novel features of construction, combination, and arrangement of parts, as will be hereinafter more fully described; and particularly pointed out in the appended claim. I

In the accompanying drawings, Figure 1 is a top plan view of a mold embodying my invention. Fig. 2 is a vertical longitudinal section thereof. Fig. 3 is a similar view of the inclosing casing.

The ordinary form of chill-n1old now in common use is composed of a metallic cylinder made of a single piece of material or one or more rings or bands connected together and is expensive of manufacture. The objection to this form of mold is that it can only be used for making a limited number of rollssay thirty-five at the utmost-and must then be replaced, as it has becomesowarped and firecracked as to be of no further use. Where a mold is made of a single piece of material, the entire mold must be discarded, even though only a portion thereof be cracked or otherwise injured, and this is also frequently the case when a mold made up of rings or hands is used, owing to unequal expansion and contraction caused by the settling and greater downward pressure in shrinkage of the molecules of the casting to the base of the mold by gravity. For this reason the'cost of Serial No. 20,592. (No model.)

manufacture of chill-molds is comparatively My invention provides a construction whereby the above-mentioned objections are avoided, the cost of production reduced, and the parts of the mold most subject to warping and cracking adapted to be readily replaced at a relatively-low cost.

In carrying my invention into practice I provide an outer inclosing tubular casing 1, having the exterior fittings of the ordinary form of mold and tapered interiorly from each end, as shown at 2, toward the center, thus forming a contracted center 3 and opposed tapering upper and lower mold chambers 4 and 5, which are widest at their mouths or outer ends, as shown. In these chambers are fitted counterpart frusto-conical mold-seetions 6 and 7, arranged in apposition and having their inner ends contacting at the center of the casing and their outer ends preferably terminating flush with the ends of the casing. The section 6 may, however, be made longer than its chamber 4 whenever it is desired to cast a roll of greater length than the casing, as indicated in broken lines in Fig. 2. The lower or base section 7 may be removably secured by screws or other suitable fastening devices 8 to maintain said section in position while the entire device is being moved about or transported, and the upper section 6 is pro vided with eyebolts 9 or similar means to fa= cilitate its withdrawal. The internal configuration of the mold-sections may be-varied to suit the shape to be given the rolls to be casted.

It is well known that in making chilled rolls the greatest pressure is downward inshrinkage and that the base portion of the ordinary form of mold cracks first, thus rendering it necessary to discard the mold, although its upper portion may be in perfectly-good condition. In my mold the inclosing casing remains-practically unaffected, and upon the cracking of the section 7 a new part may be substituted therefor and the upper section 6 5 than the lower section, and my construction IOO obviates the necessity of discardingboth when one becomesinjured. The construction is also mold-sections arranged in apposition and reof advantage in making a perfectly-formed movably mounted in said chambers, substanrollhavingawearing surface harder than that tially as set forth. 15 5 obtained in the ordinary mold. In testimony whereof I have hereunto set Having thus described my invention, What my hand in presence of two subscribing wit- 1 claim, and desire to secure by Letters Patmesses. ent, is I FRANK GORMAN.

flaring mold-chambers, and frusto-conical In a mold for making chilled rolls, the com- \Vitnesses: IO bination of an inclosing casing tapering in- W. J. VHITE,

teriorly from each end and forming reversely- GEO. A. MCLAUGHLIN. 

